46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/core/make.hpp>
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#include <boost/hana/core/tag_of.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/range.hpp>
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#include <boost/hana/unpack.hpp>
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#include <laws/base.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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int main() {
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hana::test::_injection<0> f{};
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::unpack(hana::make_range(hana::int_c<0>, hana::int_c<0>), f),
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f()
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::unpack(hana::make_range(hana::int_c<0>, hana::int_c<1>), f),
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f(hana::int_c<0>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::unpack(hana::make_range(hana::int_c<0>, hana::int_c<2>), f),
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f(hana::int_c<0>, hana::int_c<1>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::unpack(hana::make_range(hana::int_c<0>, hana::int_c<3>), f),
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f(hana::int_c<0>, hana::int_c<1>, hana::int_c<2>)
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));
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// Previously, we would only unpack with `std::size_t`s. Make
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// sure this does not happen.
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hana::unpack(hana::make_range(hana::int_c<0>, hana::int_c<1>), [](auto x) {
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using T = hana::tag_of_t<decltype(x)>;
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static_assert(std::is_same<typename T::value_type, int>{}, "");
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});
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}
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